Which of the following statements about nationalism is false? a. nationalism is a unifying force that has resulted in the creation of multiple nation-states. b. nationalism has been used as a force of murder and genocide. c. nationalism has caused many multi-ethnic states to break apart. d. nationalism is no longer the powerful force that it was in the past.

The correct option is B.
Nationalism is an economic and political system that is characterized by promotion of the interest of a particular country with the aim of gaining or maintaining self governance over the groups' home land.
Nationalism has never been used as a force of murder and genocide.

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Why the planet stays in orbit is because of inertia (object stays in motion until a force changes it’s motion) also the atmosphere and gravity!